/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.dubbo.xds.security.authz.rule.source;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.xds.security.authz.rule.tree.RuleNode.Relation;
import org.apache.dubbo.xds.security.authz.rule.tree.RuleRoot;
import org.apache.dubbo.xds.security.authz.rule.tree.RuleRoot.Action;
import org.apache.dubbo.xds.security.authz.rule.tree.RuleTreeBuilder;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Default rule factory that supports common AuthorizationPolicy properties
 */
public class MapRuleFactory implements RuleFactory<Map<String, Object>> {

    @Override
    public List<RuleRoot> getRules(URL url, List<Map<String, Object>> ruleSources) {

        List<RuleRoot> roots = new ArrayList<>();

        for (Map<String, Object> sourceMap : ruleSources) {

            Action action = Action.map((String) sourceMap.get("action"));
            if (action == null) {
                throw new RuntimeException("Parse rule map failed: unknown action");
            }

            RuleTreeBuilder builder = new RuleTreeBuilder();
            RuleRoot ruleRoot = new RuleRoot(Relation.AND, action);
            builder.addRoot(ruleRoot);

            ArrayList<Relation> levelRelations = new ArrayList<>();
            // from|to|...
            levelRelations.add(Relation.AND);
            // from.source[0]|from.source[1]|...
            levelRelations.add(Relation.OR);
            // from.source.principle|from.source.namespaces|...
            levelRelations.add(Relation.AND);

            Map<String, Object> ruleMap = new HashMap<>(1);
            ruleMap.put("rules", sourceMap.get("rules"));

            builder.setPathLevelRelations(levelRelations);
            builder.createFromRuleMap(ruleMap, ruleRoot);

            roots.addAll(builder.getRoots());
        }
        return roots;
    }
}
